Bird Gizzard Stones
Which birds use gizzard stones?
The stomach of birds is divided into two pouches,
unlike ours which have only one. The gizzard is the
second pouch. In birds that eat soft foods the gizzard
isn't much different from the first portion of the stomach.
Birds that eat seeds and other harder food, which
includes many families and species, have variously
developed muscular, grinding gizzards. See Leahy,
The Birdwatcher's Companion or other references
for more detail.
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Update: June 2012